Device for materials testing in nuclear reactors

Abstract

A testing device for load-testing of specimens (3) in a nuclear reactor environment is attached to one of the pipes (1) of the reactor for conveying a first medium under pressure and provides a first space (14) in open communication with the pipe (1). In the first space (14) a movable pull rod (15) is arranged, one end of which is attached to one half (16) of a specimen (3) arranged in the space (14). The other end of the pull rod (15) is joined to a tensile force device capable of being influenced by the first medium for achieving a tensile stress in the specimen (3).

I claim: 
     
       1. A device for load-testing of specimens (3) in a nuclear reactor environment, characterized in that at one of the pipes (1) of the nuclear reactor for conveying a first medium under pressure, there is fixed a testing device (2) comprising a first space (14) in open communication with said pipe (1), a movable pull rod (15) arranged in said first space (14), one end of said pull rod (15) being intended to be attached to one half (16) of a specimen (3) arranged in the space (14), the other end of said pull rod (15) being joined to a tensile force device, capable of being influenced by the first medium, for achieving a tensile stress in the specimen (3) via the pull rod (15). 
     
     
       2. A device according to claim 1, characterized in that the testing device (2) comprises a first sleeve (13, 6, 8), connected to the pipe (1) in open communication, and an extension, which is movable in relation to the first sleeve, in the form of a second sleeve (9), said sleeves together surrounding at least part of said first space (14), a pull rod (15) arranged in said first space (14) with one end fixed to the movable second sleeve (9), the other end of the pull rod (15) being adapted to be attached to one half (16) of a specimen (3) fixed in the space (14), said second sleeve (9) being adapted to be influenced by a first medium supplied from the pipe (1) in order to achieve a tensile stress in the specimen (3) via the pull rod (15). 
     
     
       3. A device according to claim 2, characterized in that the first and second sleeves are interconnected by means of a bellows (10), said second sleeve (9) and bellows (10) being surrounded by a third sleeve (11) forming a second space (12) around said second sleeve (9) and the bellows (10), said second sleeve (12) containing or being connectable to a second medium of lower pressure than said first medium. 
     
     
       4. A device according to claim 3, characterized in that said second space (12) is also connectable to a medium of the same or a higher pressure in relation to said first medium. 
     
     
       5. A device according to claim 1 or 2, characterized in that several specimens (3) are connected in series in said first space (54). 
     
     
       6. A device according to claim 1 or 2, characterized in that the testing device (2, 42) is detachably attached to said pipe (1, 41).